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F.4L. GORMLEY.

LIFTING JACK.

APPILICATION FILED FEB. In. 1919.

Patented Sept. 9,1919.

8 P- w 5 h 6 4 mw w m w 2116 a a w a w 8 mV m mm i as UNITED STATES PATENT OFFICE.

ream; L. GORMLEY, or BROOKLINE MAssAoHnsE'rrs, hssrenon no, t. o. Neuron,-

me, or o e; nassaoriusn'rrsj ooaroitn'rion or ivriirnrt LIFTINGJAGK.

Specif cation of Letters Patent. Patepijgd 9,

Application filed February 18. 1919. Serial No. 279.457.

and particularly to that class of lifting jacks known as screw jacks.

The object of the present invention is to provide a simple means for adjusting the bevel gears of the jack so that they. willbe in proper. mesh at all times. 1 .The inventionconsists in providing the main casing with an oinclined surface with which coacts the taperedendofanadjustingmember threaded tothe cover .plate .supporting the spindle or shaft of the driving gear whereby vertical movement. may

be imparted to said cover plate relatively to the casing towhich it is attache The invention consists further in the provision of a locking device for retainingthe adjusting member in adjusted position.

The invention further consists in certain novel features of construction and arrangement of parts which will be readily under stood by reference tothe description of the drawings and to the claims hereinafter given.

For the purpose of illustrating the invention, one preferred form thereof is illustrated inthe drawings, this form I having been found to givesatisfactory and reliable results, although it is to be und'erstoodthat the various instrumentalities of which the invention consists can be variously arranged and organized, and that the invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described, exceptas re quired by the scope of the appended claims.

Of the drawings:

Figure 1 represents a sectional elevation of a lifting jack embodying the features of the present invention.

Fig. 2 representsan' elevation-of the lower part of the cover plate and the adjusting and clamping members therefor.

Fig. 3 represents a sectional detail of the adjusting device and the locking mechanism therefor.

Fig. t represents a sectional detail or Fig. a j .1 Simi a :c a eet eindicate;like: nests threus e t th eve al i u s o the rawhea iustinsmemb r and shcn' nstlle eerated headthere a d. a

ig. 5 represents a section on line 5 5, .on

Ing i a a ahe awing rep e en suita le base supporting a stationary Stan ard 111 ever the ou p iphery f Wh hiafit ab e lee st hei nper e s Which isv-threaded. a cap :15. In theupper end of the standard 11 is mounted a nut 1e to w s t r ad d lifting screw 15 ha ing plin d. to s ppe re ed and. a igearldwith which meshes a gearl formed up n or eeure t ya r vo ub sha t ith outer u w h is provide w th asaable operating mec anism f. enamel knew-n c s r etieent pese bet ee th l rep are o he sea 16am the inne f c of a the ear 3 a e t nnular pla eeQ an 2. seven h ch ar inte p sed. a plur ity o r fr-iction members Between the plate 20 audit u pe a of h em 16- s e tricn disk 23.

The movab e sleeve 1 @mtidfi th a rectangular chamberedwextenslon 245 11 w h s mou t d a train o se rns wh is not shown or described in detail asit form o. pa t th p e en in ention- The chambered extension 24: is provided with a cover plate 25 having plurality of vertical slots 26 therein through which extend the shanks of the clampingbolts 27,

said shanks being threaded to the extension .24;-

he cover plate 25 is provided with a bearing 28. forthe shaft or spindlel8.

.It isv o us h by loo n nsm la p bolts 27, the cover plate may bemoved vertically to brin the gears 16 and 17 in proper mesh. a

One of the horizontal walls of the eaten -sion 24., preferably the lower nail, is pro vided with an inclined. surface -29. with which eoacts the taperedend 30 of an adjusting member 31. This adjusting merit ace her 31 is threaded to the cover plate "25 9.95

and when rotated thereinit will.be,moved -endwise in anv obvious manner.

Ifthe adjusting member 31- is moved inwardly into theposition indicatedin Fig.

,3, th ta ered. and. .30 coacting. with the. in- .llO

said adjusting member 31, said member is provided with a cylindrical head 32 having turning wings 33 on the outer face and a plurality of V-shaped serrations 34 on its inner face.

Projecting inwardly from the cover plate 25 is a tubular boss .35 having a diametral slot 36 in its inner end, said slot having parallel flat sides.

- Inthe tubular boss35 is {positioned a cylindri'cal bolt 37 with its outer wedge-shaped "end 38 projecting beyond the outer face of said cover plate 25 and coacting with the V shaped serrations 3 1 in the head 32 of the adjusting member 31.

The bolt 37 is provided with a square shank 39 extending through the slot 36 with two flat sides thereof coacting with the flat sides of the slot 36 and thereby preventing said bolt from rotating about its axis.

Within the tubular boss 35 and sur rounding the shank 39, is a spring 40 adapted to force thebolt 37 outwardly and cause the wedge shaped end 38 to coact with the serrations 34 at all times.

These serrations are of such a shape that when pressure is applied to the wings 33, the adjusting member 31 may be rotated, the bolt 37 moving inwardly against the tension of the spring 40.

As soon as the member 31 has been adjusted, further accidental rotation thereof is prevented by the locking bolt 37.

This makes a very simple and effectual means for adjusting the cover plate 25 and bringing the gears 16-17 into proper mesh.

It is believed that the operation and many advantages of the invention will be fully understood without further description.

Having thus described my invention I claim '1. In a lifting jack a casing having a lateral rectangular extension, a horizontal inner wall of which is provided with a beveled surface; a cover plate for said extension provided with vertical slots; bolts extending through said slots into said extension; and an adjusting member threaded to said cover and provided with a tapered end coacting with said inclined surface.

2. In a lifting jack a casing having a lateral rectangular extension, a horizontal inner wall of which is provided with a beveled surface; a cover plate for said extension provided with vertical slots; bolts extending through said slots into said extension; an adjusting member threaded to said cover and provided with a tapered end coacting with said inclined surface; and means for locking said member in adjusted position.

3. In a lifting jack a casing having a lateral rectangular extension, a horizontal inner wall of which is provided with a. beveled surface; a cover plate for said extension provided with vertical slots; bolts extending through said slots into said extension; an adjusting member threaded to said cover and provided with a tapered end coaoting with said inclined surface; a head on said adjusting member having serrations on its inner face; and a locking member coacting with said serrations.

1. In a lifting jack a casing having a lateral rectangular extension, a horizontal inner wall of which is provided with a beveled surface; a cover plate for said extension provided with vertical slots; bolts extending through said slots into said extension; an adjusting member threaded to said cover and provided with a tapered end coacting with said inclined surface; a head on said adjusting member having serrations on its inner face; and a spring pressed bolt having a wedge shaped end coacting with said serrations.

5. In a lifting jack a casing havin a lateral rectangular extension, a horizontal inner wall of which is provided with a beveled surface; a cover plate for said extension provided with vertical slots; bolts extending through said slots into said extension; an adjusting member threaded to said cover and provided with a tapered end coacting with said inclined surface; a head on said adjusting member having serrations on its inner face; and a spring pressed. bolt having a wedge shaped end coacting with said serrations; said bolt having associated therewith means for preventing its rotation.

6. In a lifting jack a casing having a lateral rectangular extension, a horizontal inner wall of which is provided with a beveled surface; a cover plate for said extension provided with vertical slots; bolts extending through said slots into said extension; an adjusting member threaded to said cover and provided with a tapered end coacting with said inclined surface; a head on said adjusting member having serrations on its inner face; a spring pressed bolt having a wedge shaped end coacting with said serrations and a flat sided shank; and a fiat sided fixed bearing for said shank.

7. In a lifting jack a casing having a lateral rectangular extension, :1. horizontal inner wall of which. is provided with a beveled surface; a cover plate for said extension provided with vertical slots, and a tubular boss on its inner face having an axial fiat sided slot'inits inner end bolts extending through said slots into said extension; an adjusting member threaded to said cover and provided with a tapered end coaoting with said inclined surface; a head on said adjusting memher having serrations 10 on its lnner face; a sprlng pressed bolt having a wedge shaped end coacting with said serrations and a square shank extending through the slot in said tubular boss.

Signed by me at 4 Post Oifice Square,

Boston, Mass, this 17th day of February, 15

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

